CN116350175A - Stereoscopic scanning device - Google Patents

Stereoscopic scanning device Download PDF

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Publication number
CN116350175A
CN116350175A CN202111622352.7A CN202111622352A CN116350175A CN 116350175 A CN116350175 A CN 116350175A CN 202111622352 A CN202111622352 A CN 202111622352A CN 116350175 A CN116350175 A CN 116350175A
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CN
China
Prior art keywords
elliptical opening
reference pattern
scanning device
stereoscopic scanning
axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202111622352.7A
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Chinese (zh)
Inventor
王静慧
吴宗训
胡志铭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qisda Optronics Suzhou Co Ltd
Qisda Corp
Original Assignee
Qisda Optronics Suzhou Co Ltd
Qisda Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qisda Optronics Suzhou Co Ltd, Qisda Corp filed Critical Qisda Optronics Suzhou Co Ltd
Priority to CN202111622352.7A priority Critical patent/CN116350175A/en
Priority to US17/736,079 priority patent/US20230204348A1/en
Publication of CN116350175A publication Critical patent/CN116350175A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • G01B11/2518—Projection by scanning of the object
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G01B11/25—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures by projecting a pattern, e.g. one or more lines, moiré fringes on the object
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/0059—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence
    • A61B5/0082—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes
    • A61B5/0088—Measuring for diagnostic purposes; Identification of persons using light, e.g. diagnosis by transillumination, diascopy, fluorescence adapted for particular medical purposes for oral or dental tissue
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
    • A61C9/00—Impression cups, i.e. impression trays; Impression methods
    • A61C9/004—Means or methods for taking digitized impressions
    • A61C9/0046—Data acquisition means or methods
    • A61C9/0053—Optical means or methods, e.g. scanning the teeth by a laser or light beam
    • A61C9/006—Optical means or methods, e.g. scanning the teeth by a laser or light beam projecting one or more stripes or patterns on the teeth

Abstract

The invention provides a stereoscopic scanning device which is used for detecting the surface profile of an object. The stereoscopic scanning device comprises an illumination light source, a first elliptical opening, a reference pattern generating member, a second elliptical opening and a light receiver. The illumination light source is used for outputting illumination light. The reference pattern generating part generates a reference pattern by using the illumination light and projects the reference pattern to the object through the first elliptical opening part. The light receiver receives a detection pattern from the object through the second elliptical opening part so as to acquire the surface profile by utilizing the difference between the reference pattern and the detection pattern.

Description

Stereoscopic scanning device
Technical Field
The present invention relates to a stereoscopic scanning device, and more particularly, to a stereoscopic scanning device capable of considering both depth of field and brightness of images.
Background
With the advancement of technology, optical scanning techniques have been widely applied to various fields, such as oral scanners. The conventional optical oral scanner projects illumination light to a grating by a light source, a grating pattern generated by the reflection of the grating is projected onto a target object through a first aperture, and the target object reflects the grating pattern to be received by an image capturing device through a second aperture. However, one of the first aperture and the second aperture of the conventional optical oral scanner is a non-elliptical pinhole, and this design affects the receivable light amount of the image capturing device, resulting in low image capturing quality. Therefore, how to design an optical scanning system that can be applied in a low illumination environment and that can achieve both the depth of field and the brightness of the image is an important development goal of the related optical design industry.
Disclosure of Invention
The present invention is directed to a stereoscopic scanning device capable of combining a scanning depth of field and image brightness, so as to solve the above-mentioned problems.
In view of the above, the present invention provides a stereoscopic scanning apparatus for detecting a surface profile of an object, the stereoscopic scanning apparatus comprising: an illumination light source for outputting illumination light; a first elliptical opening portion; a reference pattern generating part for generating a reference pattern by using the illumination light and projecting the reference pattern to the object through the first elliptical opening part; a second elliptical opening portion; and a light receiver for receiving the detection pattern from the object through the second elliptical opening part so as to obtain the surface profile by utilizing the difference between the reference pattern and the detection pattern.
Preferably, the difference between the first ratio of the major axis to the minor axis of the first elliptical opening and the second ratio of the major axis to the minor axis of the second elliptical opening is less than a predetermined threshold.
Preferably, the first included angle of the major axis and/or the minor axis of the first elliptical opening part relative to the reference pattern is the same as or similar to the second included angle of the major axis and/or the minor axis of the second elliptical opening part relative to the reference pattern.
Preferably, the reference pattern has a plurality of adjacent stripes, and the long axis of the first elliptical opening axially intersects the arrangement direction of the plurality of stripes.
Preferably, the reference pattern has a plurality of adjacent stripes, and the long axis of the second elliptical opening axially intersects the arrangement direction of the plurality of stripes.
Preferably, the angle between the long axis and the alignment direction is ninety degrees, or the long axis is substantially perpendicular to the alignment direction and has an allowable angle error.
Preferably, the first elliptical opening and the second elliptical opening respectively belong to a fixed aperture opening or a variable aperture opening.
Preferably, the reference pattern has a plurality of stripes arranged adjacently, at least one of the major axis of the first elliptical opening and the major axis of the second elliptical opening extends along the stripe direction of the plurality of stripes, so as to maintain the scanning depth of field of the stereoscopic scanning device and increase the brightness of the detection pattern.
Preferably, the reference pattern has a plurality of adjacent stripes, and at least one of the short axis of the first elliptical opening and the short axis of the second elliptical opening is shortened along the arrangement direction of the plurality of stripes, so as to maintain the brightness of the detection pattern and increase the scanning depth of field of the stereoscopic scanning device.
Preferably, the reference pattern generating element is a digital micro mirror assembly, and the reference pattern is a predetermined grating pattern generated by the digital micro mirror assembly.
The stereoscopic scanning device is mainly designed as an optical mold taking device for dental use. The light source cannot be placed in the oral cavity of a patient, the effect of the external light source for illuminating the oral cavity of a medical person is limited, and the optical system of the optical model taking device needs to be improved to improve the detection accuracy, so that the stereoscopic scanning device provided by the invention can maintain the due brightness of a modeling image while keeping the depth of field required by scanning application by adjusting the shape, the proportion and/or the size of the opening of the aperture unit, thereby ensuring that the accurate and clear object surface profile can be obtained.
Drawings
Fig. 1 is a schematic diagram of a stereoscopic scanning apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a first elliptical opening and a second elliptical opening according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a reference pattern, a first elliptical opening and a second elliptical opening according to an embodiment of the present invention.
FIG. 4 is a schematic view of a first elliptical opening portion according to another embodiment of the present invention.
Detailed Description
For a further understanding of the objects, construction, features, and functions of the invention, reference should be made to the following detailed description of the preferred embodiments.
Referring to fig. 1, fig. 1 is a schematic diagram of a stereoscopic scanning apparatus 10 according to an embodiment of the invention. The stereoscopic scanning apparatus 10 scans and detects the surface profile of the object Ot using an optical technique. In the embodiment of the invention, the object Ot may be a tooth, and the stereoscopic scanning apparatus 10 may be an optical model taking apparatus for dental use, but the practical application is not limited thereto. The stereoscopic scanning apparatus 10 may include an illumination light source 12, a first optical module 14, a second optical module 16, a reference pattern generating member 18, and a light receiver 20. The illumination light B output from the illumination light source 12 generates a reference pattern Pr via the reference pattern generator 18. The reference pattern Pr is projected onto the object Ot through the first optical module 14 and the reflective sheet 22, and the reflected detection pattern Pd is received by the second optical module 16 through the optical receiver 20 to convert the surface profile of the object Ot.
The illumination source 12 may include three light emitting units 24, 26 and 28, which may be red light emitting diodes, blue light emitting diodes and green light emitting diodes, respectively; the application end of the method depends on the design requirement, so the method is not defined in detail. The illumination source 12 may further comprise a plurality of optical elements, such as a light reflecting sheet, a light filter, a light diffusing sheet, and a light splitting sheet; the number, optical characteristics, placement position and angle of which are dependent on the light emission characteristics of the light emitting units 24, 26 and 28. The illumination light B output from the illumination light source 12 may be selectively transmitted to the reference pattern generating member 18 using the reflection sheet 30.
In an embodiment of the present invention, the reference pattern generator 18 may be a digital micromirror array (Digital Micromirror Device, DMD for short) having a plurality of micromirrors arranged in an array. The micro mirrors generate a predetermined grating pattern as a reference pattern Pr according to a control instruction. For example, a digital micromirror combination may indicate that an odd numbered row or column of micromirrors, or an even numbered row or column of micromirrors, or a particular location (not limited to a row or column) of micromirrors provides a reflecting function, while other micromirrors turn to non-reflect illumination light B, thereby creating a predetermined raster pattern. The reference pattern generator 18 may also be other optical or non-optical component combinations, with variations depending on design requirements.
The first optical module 14 and the second optical module 16 may each include a plurality of optical elements and aperture units; the optical element may be various types of convex and/or concave lenses, and the aperture unit is a structure having an elliptical opening. In other words, the first optical module 14 may have at least a first elliptical opening 32, and the second optical module 16 may have at least a second elliptical opening 34, each located on the aperture unit of its optical module. The first elliptical opening 32 and the second elliptical opening 34 are used for filtering out the illumination light B of the non-focal plane so as to generate a clearer reference pattern Pr and a clearer detection pattern Pd. The light receiver 20 is a common image capturing Device, such as a Charge-coupled Device (CCD) or a complementary metal oxide semiconductor (Complementary Metal-Oxide Semiconductor, CMOS), but the practical application is not limited thereto.
Referring to fig. 2, fig. 2 is a schematic diagram of a first elliptical opening 32 and a second elliptical opening 34 according to an embodiment of the invention. The first elliptical opening 32 may have a first major axis Ax1 and a first minor axis Ay1, the second elliptical opening 34 may have a second major axis Ax2 and a second minor axis Ay2, and a difference between a first ratio of the first major axis Ax1 to the first minor axis Ay1 and a second ratio of the second major axis Ax2 to the second minor axis Ay2 may be smaller than a predetermined threshold value. The allowable range of the predetermined threshold value may be one percent to ten percent, but the actual value is not limited thereto. The present invention defines the difference between the first ratio and the second ratio, thereby defining two elliptical light holes having the same or similar shape and ratio of the long and short axes for the first elliptical opening 32 and the second elliptical opening 34.
Referring to fig. 3, fig. 3 is a schematic diagram of a reference pattern Pr, a first elliptical opening 32 and a second elliptical opening 34 according to an embodiment of the invention. The reference pattern Pr may have a plurality of stripes adjacently arranged, the plurality being at least two, that is, the aforementioned predetermined grating pattern. The detection pattern Pd is deformed by the stripes due to reflection from the object Ot. The first elliptical opening 32 and the second elliptical opening 34 are preferably arranged with the major axis/minor axis aligned with each other, or may be defined as: the steering angle of the first elliptical opening portion 32 with respect to the extending direction Ds or the arrangement direction Da of the reference pattern Pr is preferably the same or similar to the steering angle of the second elliptical opening portion 34 with respect to the extending direction Ds 'or the arrangement direction Da' of the detection pattern Pd. In other words, the first included angle of the first major axis Ax1 and/or the first minor axis Ay1 of the first elliptical opening 32 with respect to one stripe (or the extending direction Ds thereof) of the reference pattern Pr may be the same or similar to the second included angle of the second major axis Ax2 and/or the second minor axis Ay2 of the second elliptical opening 34 with respect to the extending direction Ds' of the detecting pattern Pd.
The reference pattern Pr and the first elliptical opening 32 (or the detection pattern Pd and the second elliptical opening 34) are not located on the same reference plane, so fig. 3 does not show the first and second angles. However, the present invention can be defined that the reference pattern Pr is adjacent to the first elliptical opening 32 along the light transmission path (i.e. the left dashed line in fig. 3) without rotation and deformation, and the included angle of each stripe of the reference pattern Pr is a first included angle with respect to the first long axis Ax 1/the first short axis Ay 1; the detection pattern Pd is adjacent to the second elliptical opening 34 along the light transmission path (i.e. the right dashed line in fig. 3) without rotation and deformation, and the angle between the extending direction Ds' of the detection pattern Pd and the second long axis Ax 2/the second short axis Ay2 is defined as the second angle. Alternatively, an included angle of the arrangement direction Da of the reference pattern Pr with respect to the first long axis Ax 1/the first short axis Ay1 may be defined as a first included angle, and an included angle of the arrangement direction Da' of the detection pattern Pd with respect to the second long axis Ax 2/the second short axis Ay2 may be defined as a second included angle.
As shown in fig. 3, the plurality of stripes of the reference pattern Pr are expanded along the extending direction Ds and are arranged along the arrangement direction Da. The major axis direction Dx1 of the first major axis Ax1 of the first elliptical opening portion 32 may intersect with the arrangement direction Da of the reference pattern Pr, and the major axis direction Dx2 of the second major axis Ax2 of the second elliptical opening portion 34 may also intersect with the arrangement direction Da of the reference pattern Pr; the intersection angle between the long axis Dx1 and the long axis Dx2 with respect to the alignment direction Da may be ninety degrees, or the long axis Dx1 and the long axis Dx2 may be substantially perpendicular to the alignment direction Da, but have an allowable angle error. The percentage of the allowable angle error depends on the overall optical-mechanical design of the stereoscopic scanning apparatus 10, for example, three to five percent, and the practical application is not limited thereto.
Generally, the first elliptical opening 32 and the second elliptical opening 34 are designed as fixed aperture openings, for example, elliptical broken holes are cut into structural members of the diaphragm unit. However, the first elliptical opening 32 and the second elliptical opening 34 may be configured as variable aperture openings, for example, the variable aperture openings may be formed by combining a plurality of sets of blades, and the aperture of the opening may be increased or decreased by changing the relative positional relationship between the plurality of sets of blades, thereby adjusting the amount of light entering the diaphragm unit.
Referring to fig. 4, a schematic view of a first elliptical opening 32A according to another embodiment of the present invention is shown in fig. 4. The first elliptical opening 32 and the second elliptical opening 34 of the previous embodiment are elliptical holes formed in the diaphragm unit, but other forms are possible. As shown in fig. 4, the first elliptical opening 32A may have an opening structure that covers the upper half area and the lower half area of the elliptical hole, so as to maintain the scanning depth of field and improve the image brightness; the second elliptical opening can also be designed in this way. The forms of the first elliptical opening and the second elliptical opening are not limited to the two embodiments disclosed above, and other possible details will not be described here.
In summary, the stereoscopic scanning device 10 of the present invention outputs illumination light B using the illumination light source 12, the illumination light B is projected onto the reference pattern generating member 18 via the reflection sheet 30, and the reference pattern Pr having a predetermined pattern is generated using the programmable characteristics of the reference pattern generating member 18. The reference pattern Pr is projected to the object Ot through the first elliptical opening 32 and the reflective sheet 22. The object Ot has a rugged surface profile, so that the object Ot is reflected to generate a detection pattern Pd; the detection pattern Pd is received by the light receiver 20 through the second elliptical opening 34. The light receiver 20 can calculate and analyze the difference between the reference pattern Pr and the detection pattern Pd, so as to determine the surface profile of the object Ot. The above-mentioned operation function means that the optical receiver 20 can be built-in with an operation processor for analysis processing, or the optical receiver 20 can transmit related data to an external operation processor, and the operation mode depends on the design requirement of the stereoscopic scanning device 10.
In the embodiment of the present invention, the stereoscopic scanning device 10 is configured with the first elliptical opening portion 32 and the second elliptical opening portion 34 with different design features according to the requirements of the user. For example, if the scanning depth of field of the stereoscopic scanning apparatus 10 is to be maintained and the brightness of the detection pattern Pd is to be increased, the stereoscopic scanning apparatus 10 may design at least one of the first long axis Ax1 of the first elliptical opening portion 32 and the second long axis Ax2 of the second elliptical opening portion 34 to be elongated along the extending direction Ds of the reference pattern Pr, thereby increasing the light receiving amount, and selectively not adjusting the lengths of the first short axis Ay1 of the first elliptical opening portion 32 and the second short axis Ay2 of the second elliptical opening portion 34 to maintain the depth of field required for scanning.
If the brightness of the detection pattern Pd is to be maintained and the scanning depth of field of the stereoscopic scanning apparatus 10 is to be increased, the stereoscopic scanning apparatus 10 may design at least one of the first minor axis Ay1 of the first elliptical opening portion 32 and the second minor axis Ay2 of the second elliptical opening portion 34 to be shortened along the extending direction Ds of the reference pattern Pr, so that the scanning depth of field can be increased accordingly, and the first major axis Ax1 of the first elliptical opening portion 32 and the second major axis Ax2 of the second elliptical opening portion 34 are not selectively adjusted to maintain the brightness of the detection pattern Pd. In particular, if the first elliptical opening 32 and the second elliptical opening 34 are fixed aperture openings, the above-mentioned extending or shortening of the major axis or the minor axis of the elliptical opening along the extending direction Ds of the reference pattern Pr refers to directly replacing the aperture unit where the elliptical opening is located; if the first elliptical opening 32 and the second elliptical opening 34 are variable aperture openings, the purpose of changing the length and the short axis is achieved by blade adjustment.
Further, the ratio between the first major axis Ax1 and the first minor axis Ay1 of the first elliptical opening portion 32 and the ratio between the second major axis Ax2 and the second minor axis Ay2 of the second elliptical opening portion 34 are preferably greater than 1.0 but less than 2.0, that is, the major axis is necessarily longer than the minor axis but the major axis is not longer than twice the length of the minor axis. If the ratio of the major axis to the minor axis is close to 1.0 under the condition of fixed minor axis, the effect of extending the major axis of the elliptical opening to improve the brightness of the reference pattern Pr and the detection pattern Pd is limited; if the ratio of the major axis to the minor axis is close to 2.0, extending the major axis of the elliptical opening portion can result in a significant brightness enhancement effect for the reference pattern Pr and the detection pattern Pd. If the ratio of the major axis to the minor axis is close to 1.0 under the condition of fixed major axis, the minor axis of the elliptical opening is shortened to adjust the resolution of the reference pattern Pr and the detection pattern Pd with less influence; if the ratio of the major axis to the minor axis is close to 2.0, shortening the minor axis of the elliptical opening portion can make the resolution of the reference pattern Pr and the detection pattern Pd significantly improved.
In summary, the stereoscopic scanning device of the present invention is mainly designed as an optical mold taking device for dental use. The light source cannot be placed in the oral cavity of a patient, the effect of the external light source for illuminating the oral cavity of a medical person is limited, and the optical system of the optical model taking device needs to be improved to improve the detection accuracy, so that the stereoscopic scanning device provided by the invention can maintain the due brightness of a modeling image while keeping the depth of field required by scanning application by adjusting the shape, the proportion and/or the size of the opening of the aperture unit, thereby ensuring that the accurate and clear object surface profile can be obtained.
The invention has been described with respect to the above-described embodiments, however, the above-described embodiments are merely examples of practicing the invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (10)

1. A stereoscopic scanning device for detecting a surface profile of an object, the stereoscopic scanning device comprising:
an illumination light source for outputting illumination light;
a first elliptical opening portion;
a reference pattern generating part for generating a reference pattern by using the illumination light and projecting the reference pattern to the object through the first elliptical opening part;
a second elliptical opening portion; and
the light receiver receives the detection pattern from the object through the second elliptical opening part so as to acquire the surface profile by utilizing the difference between the reference pattern and the detection pattern.
2. The stereoscopic scanning device according to claim 1, wherein a difference between a first ratio of a major axis to a minor axis of the first elliptical opening portion and a second ratio of a major axis to a minor axis of the second elliptical opening portion is smaller than a predetermined threshold value.
3. The stereoscopic scanning device according to claim 1, wherein the first angle of the major axis and/or the minor axis of the first elliptical opening with respect to the reference pattern is the same or similar to the second angle of the major axis and/or the minor axis of the second elliptical opening with respect to the reference pattern.
4. The stereoscopic scanning device according to claim 1, wherein the reference pattern has a plurality of stripes adjacently arranged, and the long axes of the first elliptical opening portions axially intersect in the arrangement direction of the plurality of stripes.
5. The stereoscopic scanning device according to claim 1, wherein the reference pattern has a plurality of stripes adjacently arranged, and the long axes of the second elliptical opening portions axially intersect in the arrangement direction of the plurality of stripes.
6. The stereoscopic scanning device according to claim 4 or 5, wherein the angle between the long axis and the alignment direction is ninety degrees, or the long axis is substantially perpendicular to the alignment direction and has an allowable angle error.
7. The stereoscopic scanning device according to claim 1, wherein the first elliptical opening and the second elliptical opening belong to a fixed aperture opening or a variable aperture opening, respectively.
8. The stereoscopic scanning device according to claim 1, wherein the reference pattern has a plurality of stripes arranged adjacently, at least one of the major axes of the first elliptical opening and the major axes of the second elliptical opening is elongated along the stripe direction of the plurality of stripes to maintain the scanning depth of field of the stereoscopic scanning device and increase the brightness of the detection pattern.
9. The stereoscopic scanning device according to claim 1, wherein the reference pattern has a plurality of stripes adjacently arranged, at least one of a short axis of the first elliptical opening portion and a short axis of the second elliptical opening portion is shortened along an arrangement direction of the plurality of stripes, thereby maintaining brightness of the detection pattern and increasing a scanning depth of field of the stereoscopic scanning device.
10. The stereoscopic scanning device according to claim 1, wherein the reference pattern generating means is a digital micromirror combination, and the reference pattern is a predetermined raster pattern generated by the digital micromirror combination.
CN202111622352.7A 2021-12-28 2021-12-28 Stereoscopic scanning device Pending CN116350175A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202111622352.7A CN116350175A (en) 2021-12-28 2021-12-28 Stereoscopic scanning device
US17/736,079 US20230204348A1 (en) 2021-12-28 2022-05-03 Three dimensional scanning apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202111622352.7A CN116350175A (en) 2021-12-28 2021-12-28 Stereoscopic scanning device

Publications (1)

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CN116350175A true CN116350175A (en) 2023-06-30

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19829278C1 (en) * 1998-06-30 2000-02-03 Sirona Dental Systems Gmbh 3-D camera for the detection of surface structures, especially for dental purposes
JP2004037317A (en) * 2002-07-04 2004-02-05 Murata Mfg Co Ltd Three-dimensional shape measuring method and three-dimensional shape measuring device
JP7280775B2 (en) * 2019-08-06 2023-05-24 株式会社キーエンス Three-dimensional shape measuring device and three-dimensional shape measuring method

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